Improvement in pitmen



w'. D. wlNToN. l Pitme'n.

Parentd Sept.29,1874'.

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I the line of the thrust and pull.

UNITED STATES PATENT OFFICE WILLIAM D; VVINTON, OF SHERIDAN, NEW YORK.

IMPROVEMENTIN PITMEN.

Specification forming part of Letters Patent No. 155,561,'datedSeptember 29,' 1874; application led September 8, 1874. A

To all whom it may concern:

Be it known that I, WILLIAM D. WINToN, of Sheridan, in the county 'ofChautauqua and State of New York, have invented certain Improvements inPitmen or Connecting-Rods, of which the following is a specification:

In pitmen, connecting-rods, and similar devices employed in machineryfor converting rotary or oscillating motion into reciprocating motion,and vice versa, the journal-boxes or eyes ofthe reciprocating partsbecome most rapidly worn at two opposite points lying in This wear soonresults in a certain amount of play of the pin or journal in its bearing-boX'," and especially in machinery running at great speed, as, forinstance, the cutter mechanism of mowing-machines, gang-saws, &c., andproduces incessant jars and shocks, which, besides being objectionableon account of the noise, impair rapidly the efficiency of the machinery,and are frequently the cause of breakageof the parts.

lTo compensate for this wear, and prevent the evil results thereof, isthe object of my invention, which consists in the arrangement of a blockof rubber, or equivalent material, in the bearing, journal-box, orwrist-pin of a pitman,

1 or similar device, at the point or points of greatest wear, whereby aclose fit of the pin or journal in the box or eye is insured, and themetallic bearing-surfaces relieved from the greater portion of thefriction and wear, ashereinafter fully set forth.

. In the imcompanying` drawing, Figure l is a side elevation of thepitman of a mowing-machine provided with my improvements. Fig. l2 is aplan view thereof. Fig. 3 is a sectional elevation of the pitman whennear the opposite extreme of movement. Fig. lis a cross- `section inline w Fig. 1. Fig. 5 is a section in line y y, Fig. 3. A

Like letters of reference designate like parts in each of the figures.

A represents the crank-wheel of a mowingmachine; a, the crank-pinthereof, and b the eye at the heel of the cutter-bar. =G is the body ofthe pitman; c, the head thereof, connecting with the pin a, and cl theremovable cap 'forining one-half thereof, and secured to the body ofthepitman by screws e. d is the wrist-pin of the pitman, engaging in theeye b of the cutter-bar. fare blocks of rubber, or equivalent material,arranged between the cap c1 and the body of the pitman on each side ofthe crankpin a., and held securely in place by the screws e. The rubberblocks j' project slightly into the eye ofthe pitman, (the eye beingpreferably slightly elongated in line of the rubber blocks,) so thatwhen they are compressed a close tit on the pin al will be produced. Inorder to prevent their being pressed backward, or away from thecrank-pin a, the blocks f are constructed on the upper and lower sidewith projecting transverse ledges g, fitting in corresponding recessesc2 of the pitman head and cap. Both of the latter are also recessedlongitudinally for the reception of the rubber blocks f, leavingprojecting ledges h on each side for the prevention of any lateraldisplacement 0f said blocks. The longitudinal recesses in the cap c1 andbody of the pitman, in which the rubber blocks f are arranged, arepreferably made slightly tapering outwardly' or away from the crank-pin,so that the cap c1, in being tightened, will act as a wedge, and pressthe rubber blocks inwardly against the crank-pin, thereby affording aready means for properly adjusting the blocks.

It is evident that the elasticity of the blocks f will insure a mostperfect and close t of the pitman-head on the crank-pin, which fit isreadily maintained by adjusting the blocks f from time to time as theybecome worn, or replacing them by nhew ones when no longer serviceable,while the lubrication is greatly simpliiicd and rendered less essential,as the antifrictional qualities of Jthe blocks j' will prevent Vheatingof the journal.

In pitmen of the curved form shown in the drawing the bearing-surfacesof the blocks f are preferably not arranged equally on both sides of thecut or joint of the journal-box, but on both sides of the line of thrustdrawn through the ,centers of the wrist-pin d and crank-pin a, asrepresented in Fig. 1.

The wrist-pin d of the pitin an is made slightly oval or reduced indiameter in the line of the thrust, as clear] y shown in the drawing.The upper portion ofthe wrist-pin is cut away, eX- cept at the outerend, where a narrow collar, d, is left. iis a block of rubber secured tothe pinyd by a cap, k, provided at t'le outer end with a pin, Z, ttingin acorresponding hole of the collar d', and fastened at the oppositeend to the pitman by a screw, m. The outer or bearing-surfaces of theblock v2 project sufciently beyond the oval sides of the wristpin tocause a close fit ofthe latter in the eye b of the cutter-bar. Thesurfaces of the pin d and cap k, between which the rubber 'block c' isclamped, are preferably made convex, as shown in Fig. 3, in order toenable the bear- Yingsurfaces of the block i to be wedged outwardly bytightening the screw m, in adjusting the block z' as it becomes worn.The latter is also readily removed and replaced by a new one, ifrequired.

The bearing-block c1 is arranged 011 that side of the Wrist-pin which ismost exposed to the friction and consequent wear, this side being abovethe thrust-line when thel crank-wheel revolves in the direction ofthearrow, Fig. 3, or below the thrust-line whenrevolving in the oppositedirection.

Although I prefer themeans shown for fastening the rubber blocks f ande'in place, the same may be modified in variousways, according to therequirements of each particular' case.

In pillow or bearing. blocks of crank-shafts,

i especially for horizontal engines, the rubber blocks f f, arrangedbetween the cap and the body of the bearing,-may be very advantageouslyemployed. The elasticity of tle rubber prevents the nuts of the boltswhich ho'd the rubber-clampingparts together from working loose.

What I claim as my invention isl. The combination of rubber blocks, orequivalent elastic material, in the eye of a pitman, or equivalentbearing. on opposite sides thereof, and in line of the pull or thrust ofthe pitman or connecting-rod, substantially as and for the purposeshereinbefore set forth.

2. The combination, with the head and cap c c1 of a pitman, providedwith recesses g and ledges h, of the rubber blocks f, constructed as andfor the' purpose herein shown and described.

3. The combination of rubber blocks, 0r equivalent elastic material, inopposite sides of the wrist-pins and journals, and in line of the pulland thrust of the pit-man or connecting-rod, 'substantially as and forthe purpose hereinbefore set forth.

4. -The combination of the wrist-pin d, cap 7c,

and rubber block i, constructed and arranged as hereinbefore set forth.

WILLIAM D. WINTON.

Witnesses:

JOHN HUToHrNsoN, 'IL A. SHELLEY.

